package thread;

class Counter {
    private int count = 0;

    synchronized public void add() {
        count++;
    }

    public int get() {
        return count;
    }

    public synchronized static void func() {
        synchronized (Counter.class) {

        }
    }
}

public class Demo19 {

    public static void main(String[] args) throws InterruptedException {
        StringBuilder stringBuffer;
        Object locker = new Object();
        Counter counter = new Counter();
        Thread t1 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                // synchronized (locker) {
                counter.add();
                // }
            }
        });
        Thread t2 = new Thread(() -> {
            for (int i = 0; i < 50000; i++) {
                // synchronized (locker) {
                counter.add();
                // }
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println("count=" + counter.get());
    }
}
